System and method for controlling the impact of process and temperature in passive signal detector for automotive ethernet

A method for performing process and temperature compensated passive signal detection, the method comprising:

• electrically connecting a drain of a first transistor to a first input of a voltage level detector, the first transistor having a threshold voltage of a first voltage value, wherein a threshold voltage corresponds to a minimum gate-to-source voltage to create a conducting path between source and drain terminals of a transistor;
• electrically connecting a drain of a second transistor to a second input of the voltage level detector, the second transistor having a threshold voltage of the first voltage value;
• applying an offset voltage across a gate of the first transistor and a source of the second transistor;
• and
• applying the offset voltage across a gate of the second transistor and a source of the first transistor,
• wherein a difference between a threshold voltage of the first voltage value and the offset voltage is constant.

Circuitry comprising:

• voltage level detector circuitry configured to detect a voltage level;
• a first transistor with a drain electrically connected to a first input of the voltage level detector circuitry, the first transistor having a threshold voltage of a first voltage value, wherein a threshold voltage corresponds to a minimum gate-to-source voltage to create a conducting path between source and drain terminals of a transistor;
• and
• a second transistor with a drain electrically connected to a second input of the voltage level detector circuitry, the second transistor having a threshold voltage of the first voltage value, wherein
• an offset voltage is applied across a gate of the first transistor and a source of the second transistor,
• the offset voltage is applied across a gate of the second transistor and a source of the first transistor, and
• a difference between a threshold voltage of the first voltage value and the offset voltage is constant.